An electric kettle transfers 360 000 J of energy in 2.0 minutes. Calculate the power of the kettle in kW. Give your answer to 2 significant figures.
[3 marks]
Total for this question: 3
All equation deep-dives
Power
Energy
AQA 8463
On the equation sheet
ORIGINAL
P = E / t and P = W / t
Power is energy per SECOND: minutes and kilowatts both have to be converted first.
Current GCSE 8463 policy: The full AQA GCSE Physics 8463 equation sheet is provided with both papers in 2026; use fluency practice to learn selection and rearrangement, not to memorise the list.
Board and spec code confirmed against AQA 8463 · registry checked 2026-07-17How this checking works
Know the equation
| Symbol | Quantity | Unit |
|---|---|---|
| P | power | W |
| E | energy transferred | J |
| W | work done | J |
| t | time | s |
Rearrangements
- E = P t
- t = E / P
- W = P t
Apply it — mark your own working
Work each one out on paper first, then reveal the mark scheme and tick the marks you actually earned. That is exactly how you should mark past papers.
Q1
Do the calculation on paper first — then mark it.
Q2
A motor has a useful power output of 1.5 kW. It lifts a load for 40 s. Calculate the work done on the load by the motor. Give your answer to 2 significant figures.
[3 marks]
Total for this question: 3
Do the calculation on paper first — then mark it.
Where the marks get lost
- Leaving the time in minutes: power needs seconds, so 2.0 minutes = 120 s.
- Leaving the power in kW when the energy is in J: 1.5 kW = 1500 W.
- Confusing W the symbol (work done, in J) with W the unit (watts).
Exam tip: Convert every quantity to J, W and s on your first line. If a power answer is needed in kW, divide the watts by 1000 at the end.
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